Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions

Jayatissa, H.; Rogachev, G. V.; Goldberg, V. Z.; Koshchiy, E.; Christian, G.; Hooker, J.; Ota, S.; Roeder, B. T.; Saastamoinen, A.; Trippella, O.; Upadhyayula, S.; Uberseder, E.

doi:10.1016/j.physletb.2020.135267

Title: Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions

Abstract

The 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reactions play an important role in astrophysics because they have significant influence on the neutron flux during the weak branch of the s-process. We constrain the astrophysical rates for these reactions by measuring partial α-widths of resonances in 26Mg located in the Gamow window for the capture. These resonances were populated using 22Ne(6Li,d)26Mg and 22Ne(7Li,t)26Mg reactions at energies near the Coulomb barrier. At these low energies α-transfer reactions favor population of low spin states and the extracted partial α-widths for the observed resonances exhibit only minor dependence on the model parameters. The astrophysical rates for both the 22Ne(α,γ)26Mg and the 22Ne(α,n)25Mg reactions are shown to be significantly different than the previously suggested values.

Publication Date:: Sun Mar 01 00:00:00 EST 2020

Research Org.:: Texas A & M Univ., College Station, TX (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

OSTI Identifier:: 1597559

Alternate Identifier(s):: OSTI ID: 1800799

Grant/Contract Number:: FG02-93ER40773; NA0003841

Resource Type:: Published Article

Journal Name:: Physics Letters B

Additional Journal Information:: Journal Name: Physics Letters B Journal Volume: 802 Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics; Physics

Citation Formats


                    Jayatissa, H., Rogachev, G. V., Goldberg, V. Z., Koshchiy, E., Christian, G., Hooker, J., Ota, S., Roeder, B. T., Saastamoinen, A., Trippella, O., Upadhyayula, S., and Uberseder, E. Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions.  Netherlands: N. p., 2020. 
Web.  doi:10.1016/j.physletb.2020.135267.

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                    Jayatissa, H., Rogachev, G. V., Goldberg, V. Z., Koshchiy, E., Christian, G., Hooker, J., Ota, S., Roeder, B. T., Saastamoinen, A., Trippella, O., Upadhyayula, S., & Uberseder, E. Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions.  Netherlands.  https://doi.org/10.1016/j.physletb.2020.135267

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                    Jayatissa, H., Rogachev, G. V., Goldberg, V. Z., Koshchiy, E., Christian, G., Hooker, J., Ota, S., Roeder, B. T., Saastamoinen, A., Trippella, O., Upadhyayula, S., and Uberseder, E. Sun .  
"Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions".  Netherlands.  https://doi.org/10.1016/j.physletb.2020.135267.

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@article{osti_1597559,

  title        = {Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions},

  author       = {Jayatissa, H. and Rogachev, G. V. and Goldberg, V. Z. and Koshchiy, E. and Christian, G. and Hooker, J. and Ota, S. and Roeder, B. T. and Saastamoinen, A. and Trippella, O. and Upadhyayula, S. and Uberseder, E.},

  abstractNote = {The 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reactions play an important role in astrophysics because they have significant influence on the neutron flux during the weak branch of the s-process. We constrain the astrophysical rates for these reactions by measuring partial α-widths of resonances in 26Mg located in the Gamow window for the capture. These resonances were populated using 22Ne(6Li,d)26Mg and 22Ne(7Li,t)26Mg reactions at energies near the Coulomb barrier. At these low energies α-transfer reactions favor population of low spin states and the extracted partial α-widths for the observed resonances exhibit only minor dependence on the model parameters. The astrophysical rates for both the 22Ne(α,γ)26Mg and the 22Ne(α,n)25Mg reactions are shown to be significantly different than the previously suggested values.},

  doi          = {10.1016/j.physletb.2020.135267},

  journal      = {Physics Letters B},

  number       = C,

  volume       = 802,

  place        = {Netherlands},

  year         = {Sun Mar 01 00:00:00 EST 2020},

  month        = {Sun Mar 01 00:00:00 EST 2020}

}

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Works referenced in this record:

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Title: Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions

Abstract

Citation Formats

Excitation energies of levels in 23Na, 24Mg and 26Mg journal, October 1976

DWBA treatment of cluster transfer reactions journal, May 1972

Re-examining the Mg 26 ( α , α ′ ) Mg 26 reaction: Probing astrophysically important states in Mg 26 journal, November 2017

Study of the 22Ne(α, n)25Mg reaction: a possible source of stellar neutronS journal, October 1969

The astrophysical implications of low-energy resonances in 22Ne + α journal, August 1993

Identification of $\gamma$-decaying resonant states in 26Mg and their importance for the astrophysical s process journal, July 2019

12C(6Li, d)16O at E(Li) = 90 MeV journal, August 1980

Probing astrophysically important states in the Mg 26 nucleus to study neutron sources for the s process journal, May 2016

Neutron-Capture Elements in the Early Galaxy journal, September 2008

Constraining the 6.05 MeV 0 + and 6.13 MeV 3 − Cascade Transitions in the C 12 ( α , γ ) O 16 Reaction Using the Asymptotic Normalization Coefficients journal, February 2015

Experimental evidence for a natural parity state in Mg 26 and its impact on the production of neutrons for the s process journal, August 2007

Reaction rates for the s -process neutron source 22 Ne + α journal, June 2012

The oxford MDM-2 magnetic spectrometer journal, May 1986

New measurement of the α asymptotic normalization coefficient of the 1 / 2 + state in O 17 at 6.356 MeV that dominates the C 13 ( α , n ) O 16 reaction rate at temperatures relevant for the s process journal, April 2015

A study in using MICROMEGAS to improve particle identification with the TAMU-MDM focal plane detector journal, November 2019

Photoexcitation of astrophysically important states in Mg 26 . II. Ground-state-transition partial widths journal, August 2010

Global optical-model potentials for the elastic scattering of 6, 7Li projectiles journal, October 1982

High-resolution study of levels in the astrophysically important nucleus Mg 26 and resulting updated level assignments journal, April 2018

Photoexcitation of astrophysically important states in Mg 26 journal, November 2009

Neutron spectroscopy of 26 Mg states: Constraining the stellar neutron source 22 Ne( α , n ) 25 Mg journal, May 2017

N 22 e ( α , n ) M 25 g : The Key Neutron Source in Massive Stars journal, October 2001

Properties of Ne 22 (α, n ) 25 Mg resonances journal, June 1991

Decay properties of 22Ne + α resonances and their impact on s-process nucleosynthesis journal, March 2020

α-cluster resonances in light nuclei journal, January 2017

The s process: Nuclear physics, stellar models, and observations journal, April 2011

New measurement of the E α lab = 0.83 MeV resonance in Ne 22 ( α , γ ) Mg 26 journal, April 2019

Constraints on the 22 Ne ( α , n ) 25 Mg s -process neutron source from analysis of nat Mg + n total and 25 Mg ( n , γ ) cross sections journal, November 2002

Sub-Coulomb α Transfers on C 12 and the C 12 ( α , γ ) O 16 S Factor journal, November 1999

Resonance neutron-capture cross sections of stable magnesium isotopes and their astrophysical implications journal, April 2012

Excitation energies of levels in 23Na, 24Mg and 26Mg
journal, October 1976

DWBA treatment of cluster transfer reactions
journal, May 1972

Re-examining the ${}^{26}{Mg} (α, α^{'}) {}^{26}{Mg}$ reaction: Probing astrophysically important states in ${}^{26}{Mg}$
journal, November 2017

Study of the 22Ne(α, n)25Mg reaction: a possible source of stellar neutronS
journal, October 1969

The astrophysical implications of low-energy resonances in 22Ne + α
journal, August 1993

Identification of $\gamma$-decaying resonant states in 26Mg and their importance for the astrophysical s process
journal, July 2019

12C(6Li, d)16O at E(Li) = 90 MeV
journal, August 1980

Probing astrophysically important states in the ${}^{26}{Mg}$ nucleus to study neutron sources for the $s$ process
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Neutron-Capture Elements in the Early Galaxy
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Constraining the 6.05 MeV $0^{+}$ and 6.13 MeV $3^{-}$ Cascade Transitions in the ${}^{12}C (α, γ) {}^{16}O$ Reaction Using the Asymptotic Normalization Coefficients
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Experimental evidence for a natural parity state in ${}^{26}{Mg}$ and its impact on the production of neutrons for the $s$ process
journal, August 2007

Reaction rates for the $s$ -process neutron source $^{22}$ Ne $+$ $α$
journal, June 2012

The oxford MDM-2 magnetic spectrometer
journal, May 1986

New measurement of the $α$ asymptotic normalization coefficient of the ${1 / 2}^{+}$ state in ${}^{17}O$ at 6.356 MeV that dominates the ${}^{13}C (α, n) {}^{16}O$ reaction rate at temperatures relevant for the $s$ process
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Global optical-model potentials for the elastic scattering of 6, 7Li projectiles
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High-resolution study of levels in the astrophysically important nucleus ${}^{26}{Mg}$ and resulting updated level assignments
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Photoexcitation of astrophysically important states in ${}^{26}{Mg}$
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